Case IH NH4006 – ARM: AUX2 Joystick Signal Out of Range High

The Armrest Controller (ARM) has detected a voltage signal from the second auxiliary joystick (AUX2) that is above the maximum expected value. This indicates an issue with signal integrity or the potentiometer responsible for generating the signal, which the controller interprets as an invalid input. As a safety measure, this condition typically leads to the deactivation of the affected hydraulic function.

• Magnum 235
• Magnum 245
• Magnum 275
• Magnum 340
• Steiger 385 Quadtrac
• Maxxum Series
• MX Series
• TG Series
• Puma Series

1. 1

   Check for other active or stored fault codes related to the Armrest Controller (ARM), such as ARM 39 or ARM 9012, which confirm an auxiliary lever circuit issue.

2. 2

   Visually inspect the wiring harness and connectors for the auxiliary joystick for pinched, frayed, or corroded wires that could cause a short circuit to a power source.

3. 3

   Test the AUX2 joystick potentiometer with a multimeter: measure resistance between the two fixed outer terminals (should be constant), then between one outer terminal and the center wiper terminal while moving the joystick (should change smoothly without erratic jumps, opens, or shorts).

1. 1

   Attempt recalibration

   Enter the tractor's diagnostic and calibration menu (often done by pressing and holding a 'program' button on the A-post or display while turning the ignition key to the 'on' position). Navigate to the ARM or Armrest section and perform the calibration procedure for the AUX Lever or EHR by moving all auxiliary levers through their full range of motion. Turn the key off, wait 30 seconds, and restart to see if the code clears.

2. 2

   Replace auxiliary joystick or potentiometer

   If calibration fails or the potentiometer tests faulty, disconnect the battery and disassemble the armrest console. Disconnect the electrical connector, remove the mounting screws, and take out the old joystick. Install the new joystick assembly (or potentiometer if available separately), reconnect the electrical connector, reassemble the armrest, and perform a new calibration.